keep up
apprise
look in on
know the score
be on the ball
know what's what
be with it
keep across
know what's going on
look around
keep someone on ice
watch it
hip
warn
dwell
withhold
keep track
whiddle
loop in
shoot from the lip
let know
have one's wits about one
triple check
micropander
double check
remember
keep a weather eye open
reconcile
follow
check on
know one's ass from a hole in the ground
wise up
know which side one's bread is buttered on
know what is what
check in
apprize
give notice
sing the same tune
notify
hold the line
send word
advise
reconfide
tell of
talk through
guard one's tongue
keep abreast
make sure
know like the back of one's hand
follow up